I boycott Trader Joe's for not having any dairy products certified with the Real Seal (and wrote an email telling them why).
I only buy ice creams from creameries in the midwest, *never* ones that use California dairy products. Both in terms of herd health (growth hormones and cramped conditions) and in terms of outdated federal pricing regulations instated prior to refrigerated transit, the California dairy industry has a lot to improve before I will ever support them.
I also don't watch any movies with Meryll Streep because of that smear campaign she did against the Washington apple growers on 60 minutes however-many years ago that was.
Most of my deep personal causes are agricultural....